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Research Methodology & Design Flashcards

7 cards from real RA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Research Methodology & Design flashcards as text

  1. A researcher wants to reduce the chance of a Type II error. Which change helps most?

    Answer: Increase the sample size

    Larger samples increase statistical power, reducing the probability of missing a true effect.

  2. Statistical power is defined as the probability of:

    Answer: Correctly rejecting a false null hypothesis

    Power equals 1 minus beta, the chance of detecting a real effect.

  3. Which sampling method divides a population into subgroups and randomly samples from each?

    Answer: Stratified random sampling

    Stratified random sampling draws random samples within defined subgroups.

  4. Snowball sampling is most useful when studying:

    Answer: Hard-to-reach or hidden populations

    Participants refer others, which helps reach groups without an accessible sampling frame.

  5. An instrument gives nearly identical scores when the same participants complete it two weeks apart. This demonstrates:

    Answer: Test-retest reliability

    Consistency of scores across repeated administrations over time is test-retest reliability.

  6. Two research coordinators score the same videotaped assessment and agree closely. This reflects:

    Answer: Inter-rater reliability

    Agreement between different observers rating the same thing is inter-rater reliability.

  7. Cronbach's alpha is commonly used to assess:

    Answer: Internal consistency of a scale

    Cronbach's alpha estimates how well items on a scale measure the same construct.